To find it definitively, you'll need to:
1. Consult a repair manual: A Haynes or Chilton manual specific to your 1996 Chevy Silverado and engine size will show you a diagram and pinpoint the EGR valve's location. This is the most reliable method.
2. Use an online diagram: Websites like AutoZone, Advance Auto Parts, or others often have diagrams for specific vehicles. You'll need your VIN or engine details to find the correct diagram.
3. Visual inspection (with caution): With the engine cold and off, carefully look around the intake manifold on the passenger side. The EGR valve is usually a small, rectangular or cylindrical component with a vacuum line connected to it. Be aware of hot surfaces and moving parts when working near the engine.
Remember safety first! If you are unsure about locating or working on the EGR valve, it is best to consult a qualified mechanic.